Disclosed are a negative electrode piece, a secondary battery (5), a battery module (4), a battery pack (1) and a device, wherein the negative electrode piece comprises a negative electrode current collector and a plurality of active material layers formed on the negative electrode current collector. The plurality of active material layers at least comprise a first active material layer and a second active material layer. The first active material layer comprises a first negative active material, and the second active material layer comprises a second negative active material. The ratio of the gram capacity of the negative active material of the first active material layer to the thickness thereof is 3.5-10.0. The ratio of the gram capacity of the negative active material of the second active material layer to the thickness thereof is 6.5-23.0. The battery using the negative electrode piece can have both a high energy density and a good cycle life.